Placeholder for unknown parameter values
unknown() creates an expression used to signify that the value will be
specified at a later time.
unknown() is_unknown(x) has_unknowns(object)
x |
An object or vector or objects to test for unknown-ness. |
object |
An object of class |
unknown() returns expression value for unknown().
is_unknown() returns a vector of logicals as long as x that are TRUE
is the element of x is unknown, and FALSE otherwise.
has_unknowns() returns a single logical indicating if the range of a param
object has any unknown values.
# Just returns an expression unknown() # Of course, true! is_unknown(unknown()) # Create a range with a minimum of 1 # and an unknown maximum range <- c(1, unknown()) range # The first value is known, the # second is not is_unknown(range) # mtry()'s maximum value is not known at # creation time has_unknowns(mtry())
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